The government seems to be keeping up a punishing offensive (or defensive, depending on how you want to look at it). My theory, or, if I want to be like Tom Friedman*, my gut, says that this is an attempt to break one of the three issues that the government is facing.
It makes sense. Obviously, a devastating strike, if civilians are not protected, will in the long run be a dangerous thing, the kind of short-term military victory that redounds poorly upon your ass. But right now the Salih government is, more than ever, buying itself time and some space in which to breathe. As stated below, I think the gamble is that the IDP issue can be kicked down the road- if the al-Huthi problem, in the immediate military sense, can be neutralized, Salih will only have two major rebellions with which to deal. If it can’t be dealt with, the state might not survive.
It might not anyway. Again, I have no idea if this is the motivation for the government, but it is the one that makes the most sense to me. We await Greg’s analysis.